Blasts Earplugs provide an exceptional combination of comfort and attenuation in hearing protection. Blasts Disposable Earplugs are designed with soft, smooth foam for comfort and are our highest noise reduction earplug with a Noise Reduction Rating (NRR) of 32dB.Blastsâ„¢ Earplugs provide an effective combination of comfort and attenuation in hearing protection. Blastsâ„¢ Disposable Earplugs are designed with soft, smooth foam for comfort and are our highest noise reduction earplug with a Noise Reduction Rating (NRR) of 32dB*. Now in a convenient and re-closable 80 count pack.